Edge grinding machine



' ou. 22, w40.

Filed June 2.2, 1938K f l 4 Sheets-sheet 1 Enc-E GRINDlNG MACHINE' Gttorneg Oct. 22, 1940. H. o. KRANIcH EDGE `@BINDING MACHINE' Filed Jane 22, y1938 4 sheets-sheet v2 Y -3nventor v HENRY 0. KKH/WGH.

GMNDING MACHINE Fired June 22, 193s 4' sheets-sheet 4 l HENRY 0.1KKAN/CH.

PatentedtOkct. y Y

' UNITED STATES #PATENT ori-ICE f 'Y 2,21s43. v Y 'EnGnGmNnING-.MACHINE y Henry 0. Kranich, Toledo, Ohio, assigner to Iht I' v *bey-Owens-Ford Glass Company, Toledo, Ohio, 'acorporation ofOhio f v mathe-'m 2.2!1938, serial Nt.' nanas i 7 Claims. (Cl, 51-96')` The present invention relates togrinding ma- Fig.- 1 is a-side elevation .of a grinding machines ingeneral and more particularly to the chine constructedv in accordance with the prestype of machine disclosed in the patent to Joseph ent invention; P. Crowley, 2,046,060, June 30, 1936, for round- Fig. 2 is anendview thereof; 4 ing and/or finishing the edges of sheets or plates Y Figs. 3 ande arevside views showing two dif- 5 of glass and the like. ferent positionslassumed by Vthe sheetfsupporti Briefly, the machine disclosed in the above pating means and pressure means vduring the vgrindent embodies a rotarygrinding wheel positioned ing operation; and v to rotate about a .substantially horizontal axis, Figs 5 and 6--are diagrammatic views showing means mounted above said AWheel for supportrespectively the .positionof the glass sheetwhen 10 ing a` plurality of gl-asssheets tok be ground on the pressure Vis initially Vapplied to the outer edge edgein a substantially vertical position, kand thereof andv the yposition of said sheet at submeans for rocking said `supporting. means to stantially the point vwhere the pressureV is rev move theglass sheets backward and forward, movedftherefrom. ,f p 1 with the edges thereof to be ground over and in Referringnow to the drawings, the` numeral 15 engagement with the grinding wheel, said sup-' I0 designatesa verticalgrinding Wheel mounted porting means being mounted in such ,a manner t0V rotate about a, horizontal axisfand provided thatit is capable of free vertical floating move# in .its periphery with a: plurality fof grooves II` ment during the rocking thereof dependinguponv Within which theedgesuoffthe sheets or plates theV contour of the sheet.' edges being ground. off glass vor theliketo be ground are adapted 20 This .invention constitutes an improvement to hereceived. T-he grindingwheel l0 v,isi reupon :the type` of grinding 4machine disclosed in ceived Within a receptaclelZr adapted to contain saidy patent andcontemplates thei provision of-4 a suitable abrasive'materialzthrough which the means for maintainingthe glass sheets in proper@ 10W1e1A pertonfsadfwheel iS adapted t0 run in engagement with the' grinding wheel during the a manner well known in the art. The topi' of 25,. v grinding operation wherebyto facilitate and imsaidreceptacle isfprovidedwith a slot through prove the grinding .action so that the sheet edges WhChV the llppel- DOItiOn Y0f the Igrinding Wheelv being treated yWill be evenly' and uniformlyk projects. 'y l ground throughout.' 1 The :means for supporting the glass .sheets to An importantl object of the invention is th be treated comprises aholder or cradl'fadesig-.o provision of novel means engaging the youter Dated in -itsnentirety bythe numeral i3', said edges of the glass sheets for applying pressure holderv being mounted'above the. grindingy'wheel f l thereto to urge, the saidl sheets `inwardly and Il for free vertical and rocking movement.y The i maintain theinner edges thereof being. yground AWorkholder I3compris,es;a pair of spaced, verti' i in proper'engagement with the grinding wheel Cel Side members I-and I4? between which a 35 during the'rocking movement of the'sheet s'up'- plurality O f;l glass s-heets v 5 t0 be :ground are portingV means.' l adapted Ato be received, said sheets ybeing dis'-` Another important objectof the invention isy pose`d` in ,a Vertical position. and the said side theprovisionv ofnovel means for mounting and members.' being soshaped that `the curvededgesv 40 actuating the pressure'meansf'so that lit will be 01 C,0me 1S ,|6 ofthe glass` sheetsjto be treatedautomatically'brought` into engagement withvthe projecttherebeyond as clearly illustrated so that glass sheets and subsequently automatically upon rockingof thel WOI'k hOldeLthe Said edges moved out of engagement therewith whenf theY Will be moved backward .and forward over and sheet supporting means reaches predetermined 'ifi engagement Wththe grinding Wheel Il).` positions in Yits rocking movement, to the endv Arranged tlaIlSYelSelY between and Carried by' 5f that pressure will be applied to the glass sheets the Side members "and I4" 0f the WIIS holder, only during such time as pressure may be vacadjacent `the upper end thereof, are aplurality tually required. vof horizontally aligned rollers lLwhile arranged Other objects and advantages of the invention transverselybtween Sad Side members adjacent will become more apparentduringthe course of the yOpposite 2,01 10Wel 'endSf heledfA efev 4a# P111- 50 the following description, when taken in connecr relity-'Of Similar 'IDlleiSV I3, Seid .Idllelfs` -l'l 4wdy tion with the accompanying drawingsf I 8 `being adapted to receive the glass sheets l5 In the drawings, wherein like numerals .are therebetween and tomaintain them-in proper poemployed to designatelike parts. throughout the sition duringthef grinding, operation. The ,said 5I same: l rollers I1 and I8 are preferably provided with al 55 plurality of grooves I9 and 20 respectively which align with the grooves II in grinding wheel I and within which grooves the corresponding edges of the glass sheets are adapted to be received.

Also positioned between and carried by the side members I4 and I4 of the work holder i3 are the rectangular plates 2| and 22 respectively, said plates being disposed at substantially right angles relative to one another and having grooves 23 and 24 respectively' which register with the grooves in rollers I1 and I8 and are adapted to receive the adjacent edges of the glass sheets I therein.

Secured to the outer surfaces of the sideimembers I4 and I4 of the work holder and extending diagonally thereof are elongated plates 25 and 28 respectively, to which are pivotally connected the inner ends of a pair of substantially horizontal, parallel supporting arms 21 and 28 respectively as indicated at 29 and 30. The supporting arms 21 and 28 are also freely mounted intermediate their ends upon a horizontal shaft 3| passing transversely through a block 32 supported upon the top of receptacle I2.l The outer ends of the arms 21 and 28 are preferably bent inwardly toward one another and suspended -therefrom are a plurality of weights 33, said weights being hung upon an eye bolt 34vattached at its upper endto the supporting arms by a transverse pin or the like `35. The Weights 33 are provided to counterbalance the'work holderv I3 so that the glass sheets being ground normally rest more or less freely upon the `grinding wheel, although the weights may be increased or decreased as desired.

Fixed uponthe shaft 3|, at one-end thereof, inwardly of supporting arm 21 is a bell-crank lever 36 comprising the two Vangularly disposed portions or legs 31 and 38. Pivoted to the outer end of leg 31 of the Vbell-crank lever as at 39 is one end of a substantially horizontal connecting rod 4D pivotally connected at its inner end as at 4I to the plate 25beneath supporting arm 21.'

Keyed to the opposite end of shaft 3|, inwardly of supporting arm 28, is a lever (not shown) but which is similar to and extends parallel withA the leg 31 of bell-crank lever 36. `Pivotally connected to the outer end of this lever is one end of a substantially horizontal connecting rod 42 extending parallel with connectingV rod 40 and being pivotally connected at its inner end as at 43to the plate 26 beneath supporting arm 28.

.Pivoted to the outerend of leg 38 of bellcrank lever 36 as at 44 is the upper Yend of av substantially vertical pitman 45. The pitman 45 is pivotally connected at its lower end as at 46 to a crank 41 keyed to a horizontal shaft 48, said shaft being driven from a motor 4S through a suitable chain and sprocket drive or the like 50 and reduction gearing located in the housing 5|. Upon rotation of the shaft 48, the pitman 45 will be given a substantially vertical upward and downward motion to effect the turning of the horizontal shaft 3| rst in one direction and then the other. lThis will impart a substantially horizontal forward Vand `backward motionfto the connecting rods 40 and 42, which will cause the work holder I3 to be rocked about the pivotal points 29 and 3D, thereby causing the glass sheets I5 to be moved backward and forward withthe curved edges I6 thereof to be ground over andin engagement with the grinding wheel I0.

In operation, and when it is desired to grind the curved edges or cornerslIi of a plurality of sheets of glass I5, the Work holder I3 is first moved to the position illustrated in Fig. 1, at which time the pitman 45 is at substantially the extreme limit of its upward movement, while the connecting rods 4I) and 42 are in retracted position. The glass sheets to be ground are then inserted horizontally into the outer open end of the holder between the upper and lower rollers I1 and I8, the upper edges a of the said sheets being received within the grooves I9 in rollers I1 while the bottom edges Vb thereof are received Within the 'grooves 2D in rollers I8 and likewise within the grooves 24 in plate 22. The glass sheets are moved inwardly until the inner edges c thereof abut the plate 2| and are received Withholder to be also rocked ina counter-clockwise direction about its pivotal points 29 -and 30 and during the turning of the said jyvork holder, the curved edges I6 of the glass sheets will be moved over and in engagement with the grinding wheel I6, as shown in Fig. 3, being received within the grooves |I thereof. The grinding wheel is bef ing simultaneously driven preferably in the op'- posite direction; The work holder is turned approximately 90 vdegrees and at the limit of its backward movement will assume substantially.

the position illustrated in Fig. 4, at which time the glass sheets will be supported by the plate 2 1|.

When the work holder is in this position, the crank 41 will have completed approximately onehalf a revolution so that upon continued turning of the said crank, the pitman 45 will be started upwardly, This will cause the shaft 3| to be rocked in a'clockwise direction to effect backward movement of the connecting rods 40 and 42, such movement causing the work holder I3 to be rocked in a clockwise direction to return it toits starting position shown in Fig. l.

Upon rocking movement ofthe work holder |3, the said holder will also be permitted to simultaneously move freely vertically depending upon the curvature of the sheet edges being groundf.l This is due to the fact that the supporting arms 21- and 23 are freely mounted upon shaft 3|. With the above construction, curved edges of different contours can be readily and conveniently ground upon the machine. This renders the machine capable of a wide use and permits the grinding of a plurality of glass sheets simultaneously, with a minimum effort and attention on the part of the operator. Ordinarily, it will be found that one backward and forward rocking movement of the work holder is sufficient to effect the desired grinding of the glass sheets.

I have found, as a result of the commercial use of this type of machine by the assignee company,

that there is sometimes a tendency for the grind.

ing of the edges or corners I6 of thelglass sheets l 2,218,648 t grinding has been completely overcome bythe lf-passing through the slots 54 therein isabolt 13 use` of my invention whichcontemplates the pro?,

:l l vision `of means for engaging and applying presi f sureftp the outerjedgesd ojf'the grass sheets |5 during,rockingmovement of the work holder to 'ur-gef itheffsaid" shee'tsj inwardly and maintain the f Y inner `edges `I6 thereof being vrground .infproperf Y, engagement with the grindingwheel. "Suchpres-V T s'uretrneansfconsists briefly ofga freely 'rotatable pressure'rollfoperatively connectedwiththe work .':holder and actuated by movement` thereofyto-,

f upon lnuts 69 and 1I! respectively.v Encircling gether' with' means for.supporting said pressure roll and causing it to'be automatically '.br'ought' intoengagement with the glass sheets and-"subsequently removed therefromwhen "said' Qworkv holder reaches predetermined positions 'in 'its rocking movement." In other words,vv the pressure is adapted kto beapplied to the outeredg'e's'of the glass sheetsronly during such time as pressure may beactually required, Vand which `has been Y "previouslydeter'mined by `thecurv'ature of the sheet edges to be groundl v, n

With reference to the drawings, the novel pressure means'comprises a pair .ofsubstantially rectangular, flat metal plate`s52 and 53 arrangedk outwardly of and secured to the side members I4 and I 4 respectively of the'work holder I3. YThe plates 52 and 53`project upwardly beyondthe Work holder. and each platel ,is provided at'its upper vend' with arelatively long transverse slot 54"which isnormally disposed Ain a substantially horizontal position.

ingr 'the vertical side members 51 andy 58 `secured at their lower ends to brackets 59 and 60V respec- I f tively carried by the receptacle I2 and connected attheir upper ends by the horizontal top member 6I.

Arranged inwardly of and carried k-)yfthg-ysidel members 51 ofthe supports 55 `and 56 is a hori zontally disposed vertical cam plate 62, the upper edge of which is suitably shaped yor'cammed to form the desired contour. As shown byuvvay ofv example, the upper edge of thegcamfplate`62 is provided with a concavely [curved-[portionf"63- which extends from the forward endo'f'fthe plate'A to a point adjacent the rear endthereof where it terminates in a horizontal'portion 64. It will of' course be appreciated, thatwhengrinding glassj sheets having different types of "curvatures, they contour of the upper edge of the camfplate is adapted to be varied accordingly. The cam plate 62 isA carriedby boltsr85 and 66 which pass through vertical slots 61 and 68v in theside mem--l bers 51 of the supports and have threaded thereA eachbolt 65 and 66 inwardly of the respective side vmember 51is a collar 1I for spacing the cam plate 62 the desired distance fromsaid side mem' bers. Due to the provision of the slots 61 and 68,.

the cam plate'62 can'be adjusted vertically as desired. Arranged inwardly'of the side membersv 58 of the supports 55 and 56 isa second cam plate 12 which isdisposed directly opposite cam plate' 62 and is similar thereto, especially as regards the contour of its upper edge. Thus, the curved and straight horizontal portions 63 and 64 ofjcam plate 12 are rsimilar to and in horizontal align# in the same mannerv that cam plate 62 is `secured to side vmembers 51.

Extending betweenthe plates 52 and' 53 and"y The I numerals 55 and 56 t designate ak pair of invertedl U-shaped supports straddling the work holder I3, and each comprishaving a nut 14 ythreaded upon one end thereof to` secure the saidbolt at the desired position within ther-5101.83.54. Mountedk upon the boit 1s between the plates 52 and53 isa collar 15'and looselyv carried thereby isV an inverted, substan-v tiallyY U-shaped Acarrier 16 comprising the substantially parallel arms 11'and 18 andthe con,

necting outer portion 19. Positioned between the arms 11 and 18, adjacent the-outer ends thereof, is the"rotatablel pressure roll ,freelyy rotatable upon a transverse pin 8|' carried vvby' saidf'ar'ms. "Thispressureroll is preferably of v relatively'soft rubben'rubber. composition, or they like.` "Alsofcarriedat the outer endjof the carrier 16 is av weight `r82"which nermally l.tends to urge thefpressure roll 88 Adownwardly and which also provides the desired pressure when the said roll engages'v the glass sheets. Carried by the arms 11 and 1,8 vand passing therethrough'is'a transverse rod 83, said rod projecting ,beyond the' said arms and' carryingat its opposite ends the supporting 'rollers' 84 and 85 which are adapted .toA ride along upon the camm'ed uppenedges of ,the

tainthe said rollersin proper position relative 'A to the cam plates 62 and'12,

Upon referenceI to'jFig".y 1, it will be seen'that plates 62 and 12v and when in this'position, the pressure roll 8 0 willwbe out of thewayf so as; not tov interfere withthe placing of the `glass sheets I5 to be ground in thework holder." After the glass sheets have been properlyr positioned within the work holder, the motor49 isplaced linoperation to rock the said'work holder ina counterclockwise direction as explainedabove., When this is done, plates l52 and 53 offth'e pressure means will ybe similarly/rockedwhereupon the n arms 11 and 18` of carrier 16 will rst be movedy e 1 to a substantially Ahorizontal positionfas showni iniFig. 3. Uponl continued rockingr movementof the 'work holder, the rollers s4 and a5 will be drawnrearwardly over the conoavelyycurved portions"63 and 63 of cam plates 62 and12 which will cause the pressure roll 'IIIIy tobelowered to engage the outer Ledges d of the Aglass sheets as illustrated in, Fig. 5. lAs *the work holderapproaches the end of its `rockinglmovement, the rollers 84 -and 85 will pass from the.

curvedsurfaces 63 and 63 p onto the at horizontal portions `I4'an'ol 64'.' as shown in Fig. 6,r

when therwork holder I3'is ydisposed in its'initial I starting position,'th'e rollers 84 :and 85.'wfill be* located adjacent the forwardends ofA thefcam 35,

therebyraising the vpressureroll'l 80fof the glass sheets as illustrated in Fig. 4. l

'- In Figs. 3 and 4 is shown respectively the position of the pressure roll 80 and associated parts before the said roll engages the glass sheets and after itismmovedoutof engagement therewith, while Figs. 5v and 6 designate respectively-the 6 points where thepressure roll initially fengages the outer edges'v of the glass sheets d and the point where the said roll is adapted to move from engagement therewith. As the glass sheets are rocked from the position shown in Fig. 5 tothe position shownin Fig. 6, the pressure roll 80 will y be helddownwardly in engagement 'with the outer edges d of the" glass sheets bythe Weight 82 and thereby'hold the inner -curved edges I6 of the'-` sheets yin vrproper engagement with the grinding .wheelso as'` to facilitate the grinding action and obtain a more even and uniformly ground surface.

I have discovered that when grinding different types of curvatures, it is necessary that the presL `sure be applied to the glass sheets at different removed from the glass sheets when the Work lholder reaches predetermined positions in its rocking movement. In other words, when grinding certain types of curves, it may be necessary for the pressure to be applied to the outer 'edges of the glass sheets throughout substantially vthe entire grinding operation, whereas When grinding other types of curves, it may be necessary for vthe pressure to be exerted upon the sheets only during a very small portion of the rocking movement of the Work holder. The extent to which the pressure roll 80 is caused to 'exert pressure upon the outer edges d of the glass sheets I5 canbe readily controlled by use of ldifferent cam plates; The pressure will be applied tothe glass sheets in the same manner upon rocking of the Work holder in aclockwise direction to return it to starting position since the bolt 13 is notslidable in the slots 54 but instead is secured in a fixed position therein. The slots 54 are provided to permit initial horizontal adjustment of the pressure roll 80 relative to the Work holder I3 depending upon the type of curvature being ground and the shape and size of the cam plates i 62and'l2. y

It is to be understood that the form of the invention herevvith shown and described is to be taken as the preferred embodiment of the same,

and that various changes inthe shape, size and arrangement of parts may be resorted to Without departing from the spirit of the invention'or the scope of the subjoined claims.

I claim :Y

1. In a machine for grinding the curved edge of aglass sheet or plate, a rotary grinding Wheel positioned to rotate about a substantially horizontal axis, means arranged above said wheel for supporting the glass sheet to be ground o ri edge in a Yvertical position, means for rocking saidsupporting means and sheet carried thereby tomove the curved edgeof the sheet to be ground over and in engagement With said grinding Wheel, means for applying pressure to the outer edge of the glass sheet to maintain the inner edge there- `of in engagement with said grinding wheel during rocking movement of said supporting means, and stationary cam means for causing said pressure means to be moved into engagement With the sheet and for subsefuently removing the same therefrom when the said supporting means reaches predetermined positions in its rocking movement.

2. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding Wheel positionedto rotate about a substantially horizontal axis, means arranged above said wheel for supporting the glass sheet to be ground on edge ina vertical position, means for rocking said supe porting means and sheet' carried thereby to move the curved edge ofthe sheet to be ground over` ment with said grinding Wheel. l I Y 3. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding Wheel positioned to rotate about a substantially horizontal axis, means arrangedabovesaid Wheel for supporting theI glass sheetto be ground on edge in a vertical position, means for rocking said supporting means and sheet carried thereby to move the curved edge of the sheet to be ground over and in engagement with said grindingvwheel, pressure means connected to and actuated by said supporting means during rocking movement thereof for engaging the outer edge of the glass sheet to hold the inner edge thereof in engagement with said grinding Wheel, and means for supporting said pressure means and for causing the same to be movedlinto engagement with the` sheet 'and subsequently removed therefrom when said supporting means'reaches predetermined positions` in its rocking movement.

4. In a machine for grinding positioned to rotate Yaboutra substantially horizontal axis, means arrangedk above said Wheel for supporting the glass sheet to be ground on edge in a vertical position, means for rocking said supporting means and sheet carried thereby to move the curved edge of the sheet to, be ground over and in engagement with said grinding wheel, a

pressure roll adapted to engage the outer edge ofY the glass sheet `for holding the inner edge thereof in engagement with said grinding Wheel during rockingv movement of the supporting Vmeans, means for pivotally connecting said pressure roll to said supporting means so that the said roll is actuated by the said supporting means upon rocking movement thereof, `and cam means for porting means and sheet carried thereby to move the curved edge ofthe sheet to be ground over and in engagement With said grinding wheel, a pressure roll adapted to engage the outer edge of the glass sheet for holding the inner edge thereof in` engagement with said grindingvvheel `during rocking movement of the supporting means, arms carrying said pressure roll at their outer ends and being piVotall-y connected at their inner Yends to said supporting means so that the said roll is actuated by the said supporting means upon rocking movement thereof, a pair of spaced substantially horizontal cam plates mounted above" said supporting means and having cammedA upper edges, and rollers carried by said arms and supported upon the cammed upper edges of said cam plates for causing the said'pressure roll to engage the sheet and to be subsequently removed therefrom when said supporting means reaches predetermined positions in its rocking movement.

6. In a machine for grinding the curved edge of aglass sheet or plate, a rotary grinding Wheel positioned to rotate about a substantially horizontal axis, means arranged above said Wheel for supporting the glass sheet to be ground on edge in a Vertical position, means for rocking said supporting means and sheet carried thereby to move the curved edge of thesheet to be ground over the curved edgev of a glass sheet 0r plate, a rotary grinding vvheel 2,218,648 `and in engagement with saidgrinding wheel,

pressure means mounted above the sheet supporting means, and means actuated by said sheet supporting means upon rocking movement thereof for causing said pressure means to apply pressure to the outer edge of the glass sheet to' maintain the inneredge thereof in engagement with said grinding wheel during rocking movement of said sheet.

'1. In a machine for grinding the curved edge of a glass sheet or plate, a rotary grinding wheel positioned to rotate about a substantially horizontal axis, means arranged above said wheel for supporting the glass sheet to be ground on edge in a vertical position, means for rocking said supl porting means and sheet carried thereby to move the curved edge of the sheet to be ground overand in engagement with saidgrinding wheel, a pressure roll mounted above the sheet supporting means, a pair of spaced, substantially horizontal cam members for supporting said pressure 

